Kerberos integration tests

Hello,

I have currently prepared the Docker environment, there are 3 containers:

• Kerberos KDC
• Presto with SSL+Kerberos
• Client machine

Link: https://github.com/mik-laj/presto-kerberos-docker

All Keytab keys, SSL certificates are generated automatically. All you need to do is run start.sh. To test the environment, you can run test.sh. Currently, Github Action is set up in this repository, so it's easy to verify that everything is working fine.

I think we can use it for automatic tests of this library as well, to verify the correct implementation of Kerberos authorization. This will require some changes to our CI environment as Kerberos is very sensitive to hostnames. In practice, this means that we will have to run all the tests in Docker because you cannot configure only KDC and Presto in Docker, and the tests on the machine, because Kerberos will detect it as a connection from another network, which will make configuration even more difficult. I think this is a good solution as Docker will also provide greater repeatability of these tests and independence from CI.

If we run everything in Docker, we can easily migrate to Github Action or another system if necessary Travis CI is not a tool that is actively developed. It is only maintained by the owners.

Best regards.

Start by reviewing the linked presto-kerberos-docker repository, especially start.sh, test.sh, and its GitHub Action configuration. Determine how the proposed Docker environment would connect to this client’s test and CI setup; done means repeatable automatic tests that verify Kerberos authorization in CI.